Stable Caesium, Rubidium and Potassium Distribution with Reference to Radiocaesium Metabolism Studies

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Abstract
The concentrations of the naturally occurring, stable alkali metals, K, Rb and Cs have been determined in tissues of ewes and 9 week old lambs. Although the three alkali metals showed different ratios among the tissues, the alkali metal ratios were similar in the two age groups, hence, the ability of ewes and lambs to discriminate between K, Rb and Cs does not seem to vary over this age range. Stable Cs and Rb, as well as 134Cs, have also been determined in blood samples from reindeer calves. Studies were carried out by ultrafiltration (cut off 10 kDa) of plasma and burst RBC. A significant fraction (20-40%) of 134Cs appeared to be associated with the high molecular weight fraction of RBC. All 134Cs in plasma was present in a low molecular weight form (<10 kDa). Analysis of stable Rb concentrations in the filtered blood samples indicated a less significant association of Rb (<10%) with the HMW fraction of RBC. These results support the assumption of a specific binding of Cs ions to intercellular components.

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